Introduction to the Acoustic Diversity Index (ADI)

Over the last three years of maintaining this blog, there’s been a conspicuous absence in the acoustic index toolkit presented so far. Whilst the Bioacoustic Index (BI), Acoustic Complexity Index (ACI) and Normalised Difference Soundscape Index (NDSI) have been introduced and demonstrated across given case studies, the Acoustic Diversity Index (ADI) hasn’t been covered to

Two new (relevant) videos

Happy new year everyone! It’s been fairly quiet on here and there’s a second instalment on the AudioMoth deployment at Lady Bay Reef which is currently in the works. This has taken much longer than expected to pull together, largely owing to going out too deep (pardon the pun) and having to rein myself in

Batch time compression and crossfade with Audacity and Python

If you’ve found this post and want to jump to the solution I’ve developed, go for it and find it further down this post – I shall not be offended. However, if you’re a regular reader of this blog and you’d like some background on why I looked into developing this process, please read ahead.

Lady Bay Reef Survey: Part 1 – tides, seagrass and acoustic complexity

As I’d indicated in my previous post, following the interesting outcome of the October 2022 AudioMoth deployment on Lady Bay reef, I intended to return and deploy a pair of AudioMoths to make further observations of the reef’s underwater environment. You can go back to the previous post if you want a more detailed overview

Acoustic complexity as an indicator of tidal activity

Back in October, I made a trip down to a reef located at Lady Bay, a beach located about two kilometers south of the township of Normanville, on the western coast of the Fleurieu Peninsula. I’d come down here with intention of deploying an AudioMoth to observe the underwater soundscape from about noon to the

Acoustic detection in monitoR – an overview

Up to now on this blog I’ve been exploring acoustic ecology and data science tools mostly within the context of acoustic indices, regular events occurring in a time series and trend-based analysis. This time around, I thought I would introduce an R package developed by Sasha D. Hafner and Jon Katz called monitoR. Its primary

NDSI: parameters in context

In an earlier post from 2021, I ran through a basic use case for an acoustic index called the Normalised Difference Soundscape Index (NDSI). For this instalment of the blog, I want to return to examining this acoustic index, examining how parameter setting can be important within the context of a given location. If you’re

Middle Farm update

There’s a couple of posts coming this month and here’s the first one explaining what’s happening (or actually, not happening) with the Middle Farm project. In November 2020, the pilot research at Middle Farm came to a dramatic halt when the deployed AudioMoth encountered the dreaded phenomena of water ingress. On a site visit in

Preparing big audio files for analysis

If you read my previous post regarding data science workflow, you might recall that I briefly made reference to large audio files and how one might prepare the data for processing and generating useful points of data. One file and one hour: Let’s say I’ve got a single audio file of an hour’s duration. I

Middle Farm Project – Part 2: Towards a project workflow

This post is a companion to the previous instalment. If you haven’t already checked it out, you can find it here. If you don’t feel like reading the previous post, this video I just made provides a basic overview. This blog instalment is intended to introduce the principles of a data science workflow and apply